CBSE Class 10 Science MCQs Set A

Two Marks Questions

1) Give two advantages of vegetative propagation

2) Define the term unisexual and bisexual giving one example of each

3) Differentiate between embryo and zygote

4) Name one sexually transmitted disease each caused due to bacterial infection and viral infection. state any two ways to prevent them

5) Draw the diagram of the longitudinal section of a) Flower and label on it a. stigma b).Ovary

6) What is placenta? state its functions

7) Differentiate between self pollination and cross pollination

8) What are the advantages of sexual reproduction over asexual reproduction

9) State four methods of contraception with example of each 10) State two functions of fallopian tube

11) Mention the functions preformed by the secretion of the glands associated with male reproductive system

12) What is the preparation shown by the uterus every month on anticipation of pregnancy?

13) Enlist the stakeholders who should be considered, while we think of conservation of forest

14) Mention two causes of pollution of river Ganga

15) What do the local people need from the forest

16) State four advantages of water stored underground over the water stored above ground in ponds/lakes

17) Mention four disadvantages of using coal/petroleum as fuels

18) Name any two plants that have been grown as monoculture in the forest belts after independence in India. What is the consequence of this practice?

19) Define variation in relation to species. Why is variation beneficial to the species.

20) In terms of evolution ,what is the significance of homology between human hand and a wing of a bird?

21) What is meant by analogous organs with example show how they support the evolution.

22) Why did Mendel choose pea plant for his experiments

23) The number of tropic levels in a food chain is limited. Why ?

24) Why do harmful chemicals concentrate as we go up in a food chain.

Three marks questions

1) Name three parts of carpel and mention one function of each of them

2) Draw a labeled diagram of the longitudinal section of a flower

3) What are male and female gonads of human being? Mention any one function of each

4) How oral pills do acts as contraceptives? What way can they be harmful?

5) How has the method of artificial selection by human helped d in the evolution of different vegetables?

6) In human beings the statistical probability of getting either a male or female child is 50:50. Give suitable explanations

7) Mention three important features of fossils which help in the study of evolution

8) Show that in Mendel’s experiment the F1 generation plants had both the parental traits, tallness and shortness

9) Explain any three factors that lead to rise of new species

10) Describe in detail the evolution of human beings or modern man

11) What is 10% law ? Explain with suitable example.

12) Why bacteria & fungi are called decomposer? List any two advantages of decomposer to the environment.

13) What is Ozone hole? Where is it located? How is it formed?

14) What changes can you make in your habits to become more environment friendly?

15) Why do we require managing our resources?

16) An environmentalist on visit to your school suggested the use of three R’s to save the environment. Explain what he meant by three R’s and how you would follow his advice at home.

Five marks questions

Q.1 a. Draw a labeled diagram of reproductive system of human female b. What happens to the lining of the uterus (i) before release of a fertilized egg (ii) if no fertilization of the ovum occurs?

Q.2 a. Draw a diagram illustrating fertilization in a flowering plant and label on it pollen grains, male germ cell, female germ cell and stigma
b. Describe the process of fertilization in plants

Q.3 Explain spore formation in Rhizopus with diagram

Q.4 Explain budding in hydra along with diagrams

Q.5 Draw a labeled diagram of a seed- opened to show the embryo. Which part of seed forms shoot and root?

Q.6 what is fission in relation to reproduction? Describe the different types with diagram

Q.7. Define regeneration. Illustrate only with diagrams the [process of regeneration in planaria

Q.8. Name an organism Mendel used for his experiments. Explain about F1 and F2 progeny obtained by Mendel when he bred the tall and the short varieties of the organism he experimented with.

Q.9. Does geographical isolation of individuals of a species lead to formation of a new species ? Provide a suitable explanation.

Q.10. a) How do Mendels experiment show that traits may be dominant or recessive ?
b.) How do Mendel’s experiment show that traits are inherited independently

Q.11) With the help of an example, explain how variation leads to evolution.

Q.12) a) Define Speciation. Explain how speciation occurs. b) Will geographical isolation be a major factor in the speciation of a self pollinating plant species ? Give reason for your answer.

VALUE BASED QUESTIONS(SCIENCE)

1. You observe that a gardener working in the park near your house collects the dry leaves from the garden and burns it. He also was synthetic fertilizers for growth of plants.
Answer the following questions based on the above information
a) Which environmental values the gardener is disrespecting?
b) How can the first activity be changed to make it environmental friendly?
c) How can the second activity be changed to promote environmental health?
d) Suggest one activity to inculcate such environmental values in students.

2. “Saving for the rainy day” is a popular proverb which means saving something for the times when it may not be available”. Examine the practice of “Rain water harvesting”.
Answer the following questions based on the above situation:
i) Explain briefly the term rain water harvesting.
ii) Which values are promoted through the practice of rain water harvesting?
iii) Suggest two activities on the part of the school to promote this practice. How can these activities promote environmental values in the community?

3. Dobereiner arranged the elements in the order of increasing atomic masses in a Triad. The arrangement was modified by John Newlands, later by Dimitri Mendelev. Even Mendeleev’s arrangement was later modified by Henry Mosley resulting in the Modern periodic table.
There are many other similar examples in the history of scientific advancement where theories and novels were modified by later scientists and the original contributors accepted these modification happily.
Answer the following questions based on the above informations:
a) How does the modern periodic law given by Mosley different from periodic law stated by Medeleev?
b) What scientific values can be associated with the above anectoles?
c) Give an example from you life experience so far that reflects display of such values by you.

4. In a certain village the sex ratio is very low due to large number of cases of female. A man from the same village takes his pregnant wife to the doctor to find out whether the foetus is a girl or a boy. The doctor performs a list and tells them that it is a girl.
Answer the following questions based on the above situation:
i) Name the technique used by the doctors to determine the type of sex o fthe foetus.
ii) Which values are disrespected by the doctor in t he above situation?
iii) Suggest two actions to be taken by the administration / society to promote desired related values.

5. You are walking by a store along with your friend. Both of you see a poster on the wall saying “say No to Plastics”. Your friend disagrees with the content of the poster and recounts the uses and advantages plastic. You contradict him saying that plastics are harmful to the environment.
Answer the following questions based on above information:
i) Which values are being disrespected by your friend by not agreeing with you?
ii) How will you convince him that plastics are harmful to the environment?
iii) Government has banned the use of plastics and was asked to use paper bags or jute bags instead. How will you get the decision implemented effectively?

6. Ethanol, commonly called as alcohol is an excellent solvent, is used in medicines and is an important chemical compound involved in
synthesis of many chemical compounds. However, inspite of its benefits to man its impact on social behavior has always been questioned. Media has often shown abnormal behavior of people while drunk. It is considered as a curse in t he lives of those who are addicted to alcohol –
“Alcoholic”, people are not only lowering their metabolism and affecting central Nervous System, they are also a threat to the lives of others. Anger and rude behavior are some of its ill effects.
Answer the following questions based on the above information:
i) Comment on the statement – “Should production of alcohol be banned?” Give three valid reasons.
ii) As a student what initiative would you take in the common concern of “Save Life, Do not Drink”? Give two suggestions.

7. Sania and Shreya are best friends and study in grade 4. Recently, Sania has been facing difficulty in reading the black board text from the last
desk. Shreya is little comfortable and wonders why Sania complains sitting in the last desk. On observation she found that Sania often carries junk food in her lunch. Shreya has starlid her lunch – full of green vegetables and fruits with her. Sania is now better and has also started taking “balanced diet”.
Answer the following questions based on the above situation:
i) Name the eye defect Sania is suffering from? What are the two possible reasons related to her eye defect?
ii) What value is displayed by shreya and Sania?
iii) How can this value be promoted? Suggest one activity

8. In a quary of sand stone, a digger found some bones below the rocks.
He took them out and was about to through them away when his fellow digger told him that this could be a fossil and they should hand it over to the museum.
Answer the following questions based on the above situations:
i) Which values are promoted by the fellow digger?
ii) What contributions are the diggers making to the scientific world?
iii) Imagine yourself to be the person in the museum whom the digger approach. What would be your response to the diggers discovery?

9. Mukesh returns home from hostel during vacation. He notices that members of his family of his family are very carefree about use of electric energy at home and oftern leave the lights, far or the refrigerator on , even when not required.
He talks to his family members at the dinner table and requests them to be more careful about use of electrical energy on environment
Answer the following questions based on the above information.
i) Write two adverse effects of wastage of electrical energy on environment.
ii) Which two vaules are reflected in Mukesh’s thoughts and actions.
iii) Mention one more action which Mukesh may take to convey his message of avoiding wastage of electrical energy to members of society.

10.Few years back, disposal plastic cups were used for serving tea in trains. The impact caused by the disposal of millions of these cups on daily basis caused serious environmental concern and disposal kulhads, made of clay, were used instead. However this resulted in the loss of fertile top soil and hence were discontinued and hence now been replaced by disposable paper cups.
Answer the following questions based on above information:
i) What is the advantage of using disposable paper cups over disposable plastic cups?
ii) Which values are promoted by using “disposable” and paper cups?
iii) Can such practices be followed at domestic level also? Give reasons.

11.Anil and Raju are friends .Anil is a art student and Raju is a science student .Anil observed that while bathing foam is formed with difficulty and an insoluable substance remains stiking to the body even after washing with water. He shared this difficulty with Raju and his problem was solved .Now he takes bath comfortably.
(a)What did Raju advice to Anil?
(b)What value was shown by Anil and Raju?

12. A(C3H6),A(C4H8)and C(C5H10)are good friends and said to belong same homologous series (CnH2n).Their behavior to other is similar and
is quite cordial among themselves .After some time another similarly looking person D(C6H12)joins them. Soon the trouble started . Its behavior to A,B,C,Dothers was different .Disharmony and fight was started between them. A,B,C got perplexed but one day they found that when little bromine was added to A,B,Cand D,the colour of bromine was not discharedwhen treated with D.
(a) How is D different from A,B and C?
(b) What conclution is drawn about relationship between the friends?

13. While classifying the elementsMendeleev faced three major limitations . Firstly he could not assign a correct position to hydrogen in his table.It
was found to resemble in properties of both alkali metals and halogens .Secondly isotopes of all elements posed to challenge to Mendeleev’s periodic law. Isotopes of an element have similar chemical properaties but different atomic masses.Third was the atomic masses of elements on the basis of which his entire formulation was based.
(a) What was the problem with atomic masses of the elements?
(b) What should a student learnt based on above concept?

14. Asth and Aaurushi are student of class x.They were given the task to study the properaties of elements. Astha studied the elements by way of
Modern Periodic Table in terms of 18 groups and seven periods.Aarushi divided the elements into different catagories such as alkali metals(6),non metals(7),inert gases(6),metalloids(7),transition metals (37), alkaline earth metals(6), rare earth elements(28),and other metals (7). Other metalsbelong to groups 13,14 and 15of Modern periodic table.These are solids ,apaque with relatively high density.
(a) Name the other metals.
(b) As a student how will you evaluate the study of elements in two different ways.

15. Social awareness about increasing human population and its control measures.Shyam asked his classmate and friend Ram that teacher tought us that human population is enormously increasing. Now question arise-
(a) How population is increasing and how does it affects us?
(b) How can we control increasing population?

16. Make society members understand that we inherit characters from our parents. Sir, Sohan and kavya asked their teacher, why our some characters are similar. Teacher asks you are brother and sister. Kavya asks again, Sir, Sohan resembles my father in some characters and in some with the mother. This is also true in my case also. How does it happen?

17. Knowledge of genetics and heredity help us in our social life in many ways. Generally, before marriage parents of boy and girl ask about father, mother and also their father-mother, of each other. Father, Rajesh asks his father what is the use of this. If affirmative explain with an example.

18. We see various objects in the beautiful and colourful world around us.
We are unable to see anything in a dark room. When light falls on an object, it bounces back and enters our eyes. This produces the sensation of vision and we are able to see objects around us. We are able to see through a transparent medium as light is transmitted through it
i) What is light?
ii) Name the phenomenon which makes visible things around us.
iii) Which type of phenomenon occurs when light passes through a transparent medium like water.
iv) Give two uses of light.

19 A person looking at a person wearing a shirt with a pattern comprising vertical and horizontal lines is able to see the vertical lines more
distinctly than the horizontal lines .This vision defect is called astigmatism. This defect occurs when cornea of eye is not perfectly spherical.This results in objects in one direction being well focused while those in perpendicular direction are not well focused.
(a) What is astigmatism?
(b) What is the cause of astigmatism?
(c) How is such a defect of vision is corrected?Explain.

20. Washing of hands is hygienic and save us from many deseases. 
Many countries celebrating global Hand W ashing day.Teacher told the students .Sir,Gobind told his teacher ,I am sorry to intrupt.But I like my friends,curious to know:
(i) How,when and why’Global Hand Washing Day’celebrated?
(ii)Why is washing hand is necessary?